I have done a few treble clefs as sculptures. They are such an interesting shape. It originally was the letter G but changed over the years. I had a small bucket of river pebbles from a garden supply and I thought that it would make an interesting combination. I was going to add lines as in lines of music but I decided it would detract from the grace of the initial form. The pun is a touch lame  but I sort of like puns so I still kept it.